@InProceedings{Seemann:1998:EUSDRTS,
  author =       "Jochen Seemann and J{\"u}rgen Wolff von Gudenberg",
  title =        "Extension of {UML} Sequence Diagrams for Real-Time
                  Systems",
  pages =        "225--233",
  booktitle =    "The Unified Modeling Language, UML'98 - Beyond the
                  Notation. First International Workshop, Mulhouse, France,
                  June 1998",
  editor =       "Jean B{\'e}zivin and Pierre-Alain Muller",
  year =         "1998",
}